I gave it a whirl:
1. Snappy, which is nice, since PyCharm can be sluggish on my Mac 2. No VCS integration 3. By default very strict code checking is turned on, which turns my (functional) code into a sea of underlines, which is not so pretty
It looks to be an interesting start, but it will need VCS integration before it looks suitable as a PyCharm replacement.
I didn't look in detail at code completion/code assist, which PyCharm does very well.